————————————————Foundationitem:Project(50971066)supportedbytheNationalNaturalScienceFoundationofChina;Project(20070299004)supportedbytheResearchFundfortheDoctoralProgramofHigherEducationofChina;Project(2008-46)supportedbytheJiangsuProvincial‘333’ProjectoftrainingtheHigh-levelTalentsFoundation;Project(BE2009127)supportedbytheJiangsuProvincialScienceSupportingItem.Correspondingauthor:CHENDengbin;Tel:+86-15952813450;E-mail:cdb521_1984@163.com;ZHAOYutao,E-mail:zhaoyt@ujs.edu.cnMicrostructureandMechanismofIn-situAl2O3(p)/AlNano-compositesSynthesizedbySonochemistryMeltReactionCHENDengbin(陈登斌)1,ZHAOYutao(赵玉涛)1,ZHUHaiyan(祝海燕)2,ZHENGMeng(郑梦)1,CHENGang(陈刚)11SchoolofMaterialScienceandEngineering,JiangsuUniversity,Zhenjiang,Jiangsu212013,PRChina2SiliconLakeCollege,KunshanJiangsu,215332,PRChinaJiangsuC&EMaterialResearchInstituteCo.,Ltd,Zhenjiang,Jiangsu212013,PRChina(Received24February2011)Abstract:The(Al2O3)p/Alnano-compositesarewerefabricatedfromAl-K2ZrF6-Na2B4O7systembysonochemistryinsitureaction.Thefabricationmechanisms,includinghighintensityultrasonicinfluencesonmicrostructuresandreinforcementparticles-aluminummatrixinterface,areinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM),respectively.TheXRDresultsshowthatthecomponentoftheas-preparedcompositesisAl2O3reinforcementTheXRDresultsshowthatthecomponentsoftheas-preparedcompositesconsistofAl2O3reinforcement.TheSEManalysisresultsindicatethatAl2O3particlesareuniformlydistributedinthealuminummatrix.TheTEMresultsshowthatthemorphologiesofAl2O3particlespresentinnearlysphere-shape,thesizesareintherangeof20-100nm,andtheinterfacesarenetandnointerfacialoutgrowthisobserved.SecondarydevelopmentImage-JsoftwareanalysisshowsthatAl2O3recoveriesarefirstlyimprovedandthendecreasedwithincreasingofultrasonicpower.Especially,whenthepoweris0.4kW,thedistributionisthebest,andamaximumnumberofparticleisobtained.Thereactionmechanismsarediscussed.Keywords:Sonochemistry;Nano-composites;